diff options
Diffstat (limited to 'winsup/cygwin/sec_helper.cc')
| -rw-r--r-- | winsup/cygwin/sec_helper.cc | 563 |
1 files changed, 0 insertions, 563 deletions
diff --git a/winsup/cygwin/sec_helper.cc b/winsup/cygwin/sec_helper.cc deleted file mode 100644 index 753f8319d..000000000 --- a/winsup/cygwin/sec_helper.cc +++ /dev/null @@ -1,563 +0,0 @@ -/* sec_helper.cc: NT security helper functions - - Copyright 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008 Red Hat, Inc. - - Written by Corinna Vinschen <corinna@vinschen.de> - -This file is part of Cygwin. - -This software is a copyrighted work licensed under the terms of the -Cygwin license. Please consult the file "CYGWIN_LICENSE" for -details. */ - -#include "winsup.h" -#include <stdlib.h> -#include <sys/acl.h> -#include <wchar.h> -#include "cygerrno.h" -#include "security.h" -#include "path.h" -#include "fhandler.h" -#include "dtable.h" -#include "pinfo.h" -#include "cygheap.h" -#include "pwdgrp.h" -#include "ntdll.h" - -/* General purpose security attribute objects for global use. */ -SECURITY_ATTRIBUTES NO_COPY sec_none; -SECURITY_ATTRIBUTES NO_COPY sec_none_nih; -SECURITY_ATTRIBUTES NO_COPY sec_all; -SECURITY_ATTRIBUTES NO_COPY sec_all_nih; - -MKSID (well_known_null_sid, "S-1-0-0", - SECURITY_NULL_SID_AUTHORITY, 1, SECURITY_NULL_RID); -MKSID (well_known_world_sid, "S-1-1-0", - SECURITY_WORLD_SID_AUTHORITY, 1, SECURITY_WORLD_RID); -MKSID (well_known_local_sid, "S-1-2-0", - SECURITY_LOCAL_SID_AUTHORITY, 1, SECURITY_LOCAL_RID); -MKSID (well_known_creator_owner_sid, "S-1-3-0", - SECURITY_CREATOR_SID_AUTHORITY, 1, SECURITY_CREATOR_OWNER_RID); -MKSID (well_known_creator_group_sid, "S-1-3-1", - SECURITY_CREATOR_SID_AUTHORITY, 1, SECURITY_CREATOR_GROUP_RID); -MKSID (well_known_dialup_sid, "S-1-5-1", - SECURITY_NT_AUTHORITY, 1, SECURITY_DIALUP_RID); -MKSID (well_known_network_sid, "S-1-5-2", - SECURITY_NT_AUTHORITY, 1, SECURITY_NETWORK_RID); -MKSID (well_known_batch_sid, "S-1-5-3", - SECURITY_NT_AUTHORITY, 1, SECURITY_BATCH_RID); -MKSID (well_known_interactive_sid, "S-1-5-4", - SECURITY_NT_AUTHORITY, 1, SECURITY_INTERACTIVE_RID); -MKSID (well_known_service_sid, "S-1-5-6", - SECURITY_NT_AUTHORITY, 1, SECURITY_SERVICE_RID); -MKSID (well_known_authenticated_users_sid, "S-1-5-11", - SECURITY_NT_AUTHORITY, 1, SECURITY_AUTHENTICATED_USER_RID); -MKSID (well_known_this_org_sid, "S-1-5-15", - SECURITY_NT_AUTHORITY, 1, 15); -MKSID (well_known_system_sid, "S-1-5-18", - SECURITY_NT_AUTHORITY, 1, SECURITY_LOCAL_SYSTEM_RID); -MKSID (well_known_admins_sid, "S-1-5-32-544", - SECURITY_NT_AUTHORITY, 2, SECURITY_BUILTIN_DOMAIN_RID, - DOMAIN_ALIAS_RID_ADMINS); -MKSID (fake_logon_sid, "S-1-5-5-0-0", - SECURITY_NT_AUTHORITY, 3, SECURITY_LOGON_IDS_RID, 0, 0); -MKSID (mandatory_medium_integrity_sid, "S-1-16-8192", - SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_MEDIUM_RID); -MKSID (mandatory_high_integrity_sid, "S-1-16-12288", - SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_HIGH_RID); -MKSID (mandatory_system_integrity_sid, "S-1-16-16384", - SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_SYSTEM_RID); - -bool -cygpsid::operator== (const char *nsidstr) const -{ - cygsid nsid (nsidstr); - return psid == nsid; -} - -__uid32_t -cygpsid::get_id (BOOL search_grp, int *type) -{ - /* First try to get SID from group, then passwd */ - __uid32_t id = ILLEGAL_UID; - - if (search_grp) - { - struct __group32 *gr; - if (cygheap->user.groups.pgsid == psid) - id = myself->gid; - else if ((gr = internal_getgrsid (*this))) - id = gr->gr_gid; - if (id != ILLEGAL_UID) - { - if (type) - *type = GROUP; - return id; - } - } - if (!search_grp || type) - { - struct passwd *pw; - if (*this == cygheap->user.sid ()) - id = myself->uid; - else if ((pw = internal_getpwsid (*this))) - id = pw->pw_uid; - if (id != ILLEGAL_UID && type) - *type = USER; - } - return id; -} - -PWCHAR -cygpsid::string (PWCHAR nsidstr) const -{ - UNICODE_STRING sid; - - if (!psid || !nsidstr) - return NULL; - RtlInitEmptyUnicodeString (&sid, nsidstr, 256); - RtlConvertSidToUnicodeString (&sid, psid, FALSE); - return nsidstr; -} - -char * -cygpsid::string (char *nsidstr) const -{ - char *t; - DWORD i; - - if (!psid || !nsidstr) - return NULL; - strcpy (nsidstr, "S-1-"); - t = nsidstr + sizeof ("S-1-") - 1; - t += __small_sprintf (t, "%u", GetSidIdentifierAuthority (psid)->Value[5]); - for (i = 0; i < *GetSidSubAuthorityCount (psid); ++i) - t += __small_sprintf (t, "-%lu", *GetSidSubAuthority (psid, i)); - return nsidstr; -} - -PSID -cygsid::get_sid (DWORD s, DWORD cnt, DWORD *r, bool well_known) -{ - DWORD i; - SID_IDENTIFIER_AUTHORITY sid_auth = {{0,0,0,0,0,0}}; - - if (s > 255 || cnt < 1 || cnt > 8) - { - psid = NO_SID; - return NULL; - } - sid_auth.Value[5] = s; - set (); - InitializeSid (psid, &sid_auth, cnt); - for (i = 0; i < cnt; ++i) - memcpy ((char *) psid + 8 + sizeof (DWORD) * i, &r[i], sizeof (DWORD)); - well_known_sid = well_known; - return psid; -} - -const PSID -cygsid::getfromstr (const char *nsidstr, bool well_known) -{ - char *lasts; - DWORD s, cnt = 0; - DWORD r[8]; - - if (nsidstr && !strncmp (nsidstr, "S-1-", 4)) - { - s = strtoul (nsidstr + 4, &lasts, 10); - while (cnt < 8 && *lasts == '-') - r[cnt++] = strtoul (lasts + 1, &lasts, 10); - if (!*lasts) - return get_sid (s, cnt, r, well_known); - } - return psid = NO_SID; -} - -BOOL -cygsid::getfrompw (const struct passwd *pw) -{ - char *sp = (pw && pw->pw_gecos) ? strrchr (pw->pw_gecos, ',') : NULL; - return (*this = sp ? sp + 1 : sp) != NULL; -} - -BOOL -cygsid::getfromgr (const struct __group32 *gr) -{ - char *sp = (gr && gr->gr_passwd) ? gr->gr_passwd : NULL; - return (*this = sp) != NULL; -} - -cygsid * -cygsidlist::alloc_sids (int n) -{ - if (n > 0) - return (cygsid *) cmalloc (HEAP_STR, n * sizeof (cygsid)); - else - return NULL; -} - -void -cygsidlist::free_sids () -{ - if (sids) - cfree (sids); - sids = NULL; - cnt = maxcnt = 0; - type = cygsidlist_empty; -} - -BOOL -cygsidlist::add (const PSID nsi, bool well_known) -{ - if (contains (nsi)) - return TRUE; - if (cnt >= maxcnt) - { - cygsid *tmp = new cygsid [2 * maxcnt]; - if (!tmp) - return FALSE; - maxcnt *= 2; - for (int i = 0; i < cnt; ++i) - tmp[i] = sids[i]; - delete [] sids; - sids = tmp; - } - if (well_known) - sids[cnt++] *= nsi; - else - sids[cnt++] = nsi; - return TRUE; -} - -bool -get_sids_info (cygpsid owner_sid, cygpsid group_sid, __uid32_t * uidret, __gid32_t * gidret) -{ - struct passwd *pw; - struct __group32 *gr = NULL; - bool ret = false; - - owner_sid.debug_print ("get_sids_info: owner SID ="); - group_sid.debug_print ("get_sids_info: group SID ="); - - if (group_sid == cygheap->user.groups.pgsid) - *gidret = myself->gid; - else if ((gr = internal_getgrsid (group_sid))) - *gidret = gr->gr_gid; - else - *gidret = ILLEGAL_GID; - - if (owner_sid == cygheap->user.sid ()) - { - *uidret = myself->uid; - if (*gidret == myself->gid) - ret = true; - else - ret = (internal_getgroups (0, NULL, &group_sid) > 0); - } - else if ((pw = internal_getpwsid (owner_sid))) - { - *uidret = pw->pw_uid; - if (gr || (*gidret != ILLEGAL_GID - && (gr = internal_getgrgid (*gidret)))) - for (int idx = 0; gr->gr_mem[idx]; ++idx) - if ((ret = strcasematch (pw->pw_name, gr->gr_mem[idx]))) - break; - } - else - *uidret = ILLEGAL_UID; - - return ret; -} - -PSECURITY_DESCRIPTOR -security_descriptor::malloc (size_t nsize) -{ - free (); - if ((psd = (PSECURITY_DESCRIPTOR) ::malloc (nsize))) - sd_size = nsize; - return psd; -} - -PSECURITY_DESCRIPTOR -security_descriptor::realloc (size_t nsize) -{ - PSECURITY_DESCRIPTOR tmp; - - if (!(tmp = (PSECURITY_DESCRIPTOR) ::realloc (psd, nsize))) - return NULL; - sd_size = nsize; - return psd = tmp; -} - -void -security_descriptor::free () -{ - if (psd) - ::free (psd); - psd = NULL; - sd_size = 0; -} - -#undef TEXT -#define TEXT(q) L##q - -/* Index must match the correspoding foo_PRIVILEGE value, see security.h. */ -static const wchar_t *cygpriv[] = -{ - L"", - L"", - SE_CREATE_TOKEN_NAME, - SE_ASSIGNPRIMARYTOKEN_NAME, - SE_LOCK_MEMORY_NAME, - SE_INCREASE_QUOTA_NAME, - SE_MACHINE_ACCOUNT_NAME, - SE_TCB_NAME, - SE_SECURITY_NAME, - SE_TAKE_OWNERSHIP_NAME, - SE_LOAD_DRIVER_NAME, - SE_SYSTEM_PROFILE_NAME, - SE_SYSTEMTIME_NAME, - SE_PROF_SINGLE_PROCESS_NAME, - SE_INC_BASE_PRIORITY_NAME, - SE_CREATE_PAGEFILE_NAME, - SE_CREATE_PERMANENT_NAME, - SE_BACKUP_NAME, - SE_RESTORE_NAME, - SE_SHUTDOWN_NAME, - SE_DEBUG_NAME, - SE_AUDIT_NAME, - SE_SYSTEM_ENVIRONMENT_NAME, - SE_CHANGE_NOTIFY_NAME, - SE_REMOTE_SHUTDOWN_NAME, - SE_UNDOCK_NAME, - SE_SYNC_AGENT_NAME, - SE_ENABLE_DELEGATION_NAME, - SE_MANAGE_VOLUME_NAME, - SE_IMPERSONATE_NAME, - SE_CREATE_GLOBAL_NAME, - SE_TRUSTED_CREDMAN_ACCESS_NAME, - SE_RELABEL_NAME, - SE_INCREASE_WORKING_SET_NAME, - SE_TIME_ZONE_NAME, - SE_CREATE_SYMBOLIC_LINK_NAME -}; - -bool -privilege_luid (const PWCHAR pname, LUID *luid) -{ - ULONG idx; - for (idx = SE_CREATE_TOKEN_PRIVILEGE; - idx <= SE_MAX_WELL_KNOWN_PRIVILEGE; - ++idx) - if (!wcscmp (cygpriv[idx], pname)) - { - luid->HighPart = 0; - luid->LowPart = idx; - return true; - } - return false; -} - -static const wchar_t * -privilege_name (const LUID &priv_luid) -{ - if (priv_luid.HighPart || priv_luid.LowPart < SE_CREATE_TOKEN_PRIVILEGE - || priv_luid.LowPart > SE_MAX_WELL_KNOWN_PRIVILEGE) - return L"<unknown privilege>"; - return cygpriv[priv_luid.LowPart]; -} - -int -set_privilege (HANDLE token, DWORD privilege, bool enable) -{ - int ret = -1; - TOKEN_PRIVILEGES new_priv, orig_priv; - ULONG size; - NTSTATUS status; - - new_priv.PrivilegeCount = 1; - new_priv.Privileges[0].Luid.HighPart = 0L; - new_priv.Privileges[0].Luid.LowPart = privilege; - new_priv.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0; - - status = NtAdjustPrivilegesToken (token, FALSE, &new_priv, sizeof orig_priv, - &orig_priv, &size); - if (!NT_SUCCESS (status)) - { - __seterrno_from_nt_status (status); - goto out; - } - - /* If orig_priv.PrivilegeCount is 0, the privilege hasn't been changed. */ - if (!orig_priv.PrivilegeCount) - ret = enable ? 1 : 0; - else - ret = (orig_priv.Privileges[0].Attributes & SE_PRIVILEGE_ENABLED) ? 1 : 0; - -out: - if (ret < 0) - debug_printf ("%d = set_privilege ((token %x) %W, %d)\n", ret, token, - privilege_name (new_priv.Privileges[0].Luid), enable); - return ret; -} - -/* This is called very early in process initialization. The code must - not depend on anything. */ -void -set_cygwin_privileges (HANDLE token) -{ - set_privilege (token, SE_RESTORE_PRIVILEGE, true); - set_privilege (token, SE_BACKUP_PRIVILEGE, true); - if (wincap.has_create_global_privilege ()) - set_privilege (token, SE_CREATE_GLOBAL_PRIVILEGE, true); -} - -/* Function to return a common SECURITY_DESCRIPTOR that - allows all access. */ - - -SECURITY_DESCRIPTOR *__stdcall -get_null_sd () -{ - static NO_COPY SECURITY_DESCRIPTOR sd; - static NO_COPY SECURITY_DESCRIPTOR *null_sdp; - - if (!null_sdp) - { - InitializeSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION); - SetSecurityDescriptorDacl (&sd, TRUE, 0, FALSE); - null_sdp = &sd; - } - return null_sdp; -} - -/* Initialize global security attributes. - Called from dcrt0.cc (_dll_crt0). */ - -void -init_global_security () -{ - sec_none.nLength = sec_none_nih.nLength = - sec_all.nLength = sec_all_nih.nLength = sizeof (SECURITY_ATTRIBUTES); - sec_none.bInheritHandle = sec_all.bInheritHandle = TRUE; - sec_none_nih.bInheritHandle = sec_all_nih.bInheritHandle = FALSE; - sec_none.lpSecurityDescriptor = sec_none_nih.lpSecurityDescriptor = NULL; - sec_all.lpSecurityDescriptor = sec_all_nih.lpSecurityDescriptor = - get_null_sd (); -} - -bool -sec_acl (PACL acl, bool original, bool admins, PSID sid1, PSID sid2, DWORD access2) -{ - size_t acl_len = MAX_DACL_LEN(5); - LPVOID pAce; - cygpsid psid; - -#ifdef DEBUGGING - if ((unsigned long) acl % 4) - api_fatal ("Incorrectly aligned incoming ACL buffer!"); -#endif - if (!InitializeAcl (acl, acl_len, ACL_REVISION)) - { - debug_printf ("InitializeAcl %E"); - return false; - } - if (sid1) - if (!AddAccessAllowedAce (acl, ACL_REVISION, - GENERIC_ALL, sid1)) - debug_printf ("AddAccessAllowedAce(sid1) %E"); - if (original && (psid = cygheap->user.saved_sid ()) - && psid != sid1 && psid != well_known_system_sid) - if (!AddAccessAllowedAce (acl, ACL_REVISION, - GENERIC_ALL, psid)) - debug_printf ("AddAccessAllowedAce(original) %E"); - if (sid2) - if (!AddAccessAllowedAce (acl, ACL_REVISION, - access2, sid2)) - debug_printf ("AddAccessAllowedAce(sid2) %E"); - if (admins) - if (!AddAccessAllowedAce (acl, ACL_REVISION, - GENERIC_ALL, well_known_admins_sid)) - debug_printf ("AddAccessAllowedAce(admin) %E"); - if (!AddAccessAllowedAce (acl, ACL_REVISION, - GENERIC_ALL, well_known_system_sid)) - debug_printf ("AddAccessAllowedAce(system) %E"); - FindFirstFreeAce (acl, &pAce); - if (pAce) - acl->AclSize = (char *) pAce - (char *) acl; - else - debug_printf ("FindFirstFreeAce %E"); - - return true; -} - -PSECURITY_ATTRIBUTES __stdcall -__sec_user (PVOID sa_buf, PSID sid1, PSID sid2, DWORD access2, BOOL inherit) -{ - PSECURITY_ATTRIBUTES psa = (PSECURITY_ATTRIBUTES) sa_buf; - PSECURITY_DESCRIPTOR psd = (PSECURITY_DESCRIPTOR) - ((char *) sa_buf + sizeof (*psa)); - PACL acl = (PACL) ((char *) sa_buf + sizeof (*psa) + sizeof (*psd)); - -#ifdef DEBUGGING - if ((unsigned long) sa_buf % 4) - api_fatal ("Incorrectly aligned incoming SA buffer!"); -#endif - if (!sec_acl (acl, true, true, sid1, sid2, access2)) - return inherit ? &sec_none : &sec_none_nih; - - if (!InitializeSecurityDescriptor (psd, SECURITY_DESCRIPTOR_REVISION)) - debug_printf ("InitializeSecurityDescriptor %E"); - -/* - * Setting the owner lets the created security attribute not work - * on NT4 SP3 Server. Don't know why, but the function still does - * what it should do also if the owner isn't set. -*/ -#if 0 - if (!SetSecurityDescriptorOwner (psd, sid, FALSE)) - debug_printf ("SetSecurityDescriptorOwner %E"); -#endif - - if (!SetSecurityDescriptorDacl (psd, TRUE, acl, FALSE)) - debug_printf ("SetSecurityDescriptorDacl %E"); - - psa->nLength = sizeof (SECURITY_ATTRIBUTES); - psa->lpSecurityDescriptor = psd; - psa->bInheritHandle = inherit; - return psa; -} - -/* Helper function to create an event security descriptor which only allows - specific access to everyone. Only the creating process has all access - rights. */ - -PSECURITY_DESCRIPTOR -_everyone_sd (void *buf, ACCESS_MASK access) -{ - PSECURITY_DESCRIPTOR psd = (PSECURITY_DESCRIPTOR) buf; - - if (psd) - { - InitializeSecurityDescriptor (psd, SECURITY_DESCRIPTOR_REVISION); - PACL dacl = (PACL) (psd + 1); - InitializeAcl (dacl, MAX_DACL_LEN (1), ACL_REVISION); - if (!AddAccessAllowedAce (dacl, ACL_REVISION, access, - well_known_world_sid)) - { - debug_printf ("AddAccessAllowedAce: %lu", GetLastError ()); - return NULL; - } - LPVOID ace; - if (!FindFirstFreeAce (dacl, &ace)) - { - debug_printf ("FindFirstFreeAce: %lu", GetLastError ()); - return NULL; - } - dacl->AclSize = (char *) ace - (char *) dacl; - SetSecurityDescriptorDacl (psd, TRUE, dacl, FALSE); - } - return psd; -} - |